Description: This map from the Florida Geological Survey Bulletin number 33, shows the structures and isopach of the Miocene, including the limits of the Hawthorn formation, areas of hard-rock phosphate, and contours indicating the top of the first Miocene. Source: Robert O. Vernon, Geology of Citrus and Levy Counties, Florida (Tallahassee, FL: The Florida Geological Survey, 1951) 180 Map Credit: Courtesy the private collection of Roy Winkelman |
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